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The problem is when i try to run my main class i get the error from above. I'm using Intellij IDEA

Added dependencies and plugin in pom.xml Ran mvn clean install, also mvn clean javafx:run But I can't run my main class

Here is what i added to pom

<dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-controls</artifactId> <version>19</version> </dependency> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-fxml</artifactId> <version>19</version> </dependency> 
<plugin> <groupId>org.openjfx</groupId> <artifactId>javafx-maven-plugin</artifactId> <version>0.0.8</version> <configuration> <mainClass>App</mainClass> </configuration> </plugin>
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File > New Project > Generators > JavaFX

I suggest starting with a new project created by IntelliJ IDEA explicitly aimed at JavaFX.

Use the JavaFX option in the Generators list, in the New Project wizard.

screenshot of New Project wizard, using JavaFX option

You will get a full working example app, that runs successfully.

The code is modularized with a module-info.java file.

screenshot of working JavaFX app with a "Hello!" button in middle of a small window

The example app uses FXML. If you wish, you can easily delete that. You can use only Java coding without any FXML markup coding — your choice. If you opt out of FXML, delete the dependency for javafx-fxml from your POM.

The POM looks like the following. Notice the inclusion of OpenJFX dependencies. I have updated some of the version numbers after looking them up on a Maven repository.

<?xml version="1.0" encoding="UTF-8"?> <project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>work.basil.example</groupId> <artifactId>fxdemo</artifactId> <version>1.0-SNAPSHOT</version> <name>fxdemo</name> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <junit.version>5.12.0</junit.version> </properties> <dependencies> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-controls</artifactId> <version>21.0.6</version> </dependency> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-fxml</artifactId> <version>21.0.6</version> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-engine</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.14.0</version> <configuration> <source>23</source> <target>23</target> </configuration> </plugin> <plugin> <groupId>org.openjfx</groupId> <artifactId>javafx-maven-plugin</artifactId> <version>0.0.8</version> <executions> <execution> <!-- Default configuration for running with: mvn clean javafx:run --> <id>default-cli</id> <configuration> <mainClass>work.basil.example.fxdemo/work.basil.example.fxdemo.HelloApplication</mainClass> <launcher>app</launcher> <jlinkZipName>app</jlinkZipName> <jlinkImageName>app</jlinkImageName> <noManPages>true</noManPages> <stripDebug>true</stripDebug> <noHeaderFiles>true</noHeaderFiles> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>

By the way, you can replace the property <junit.version>5.9.1</junit.version> and the pair of JUnit dependencies with this simpler single “Aggregator” dependency:

<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter --> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter</artifactId> <version>5.12.0</version> <scope>test</scope> </dependency>

Like this:

<?xml version="1.0" encoding="UTF-8"?> <project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>work.basil.example</groupId> <artifactId>demoFX</artifactId> <version>1.0-SNAPSHOT</version> <name>demoFX</name> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-controls</artifactId> <version>21.0.6</version> </dependency> <dependency> <groupId>org.openjfx</groupId> <artifactId>javafx-fxml</artifactId> <version>21.0.6</version> </dependency> <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter --> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter</artifactId> <version>5.12.0</version> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.14.0</version> <configuration> <source>19</source> <target>19</target> </configuration> </plugin> <plugin> <groupId>org.openjfx</groupId> <artifactId>javafx-maven-plugin</artifactId> <version>0.0.8</version> <executions> <execution> <!-- Default configuration for running with: mvn clean javafx:run --> <id>default-cli</id> <configuration> <mainClass>work.basil.example.demofx/work.basil.example.demofx.HelloApplication</mainClass> <launcher>app</launcher> <jlinkZipName>app</jlinkZipName> <jlinkImageName>app</jlinkImageName> <noManPages>true</noManPages> <stripDebug>true</stripDebug> <noHeaderFiles>true</noHeaderFiles> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>
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I hope this question doesn’t get closed, then as all the future duplicates come in that use Idea and JavaFX, I can just close them as a duplicate of this answer :-)

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